Odd QIC-like tape
ard at p850ug1.demon.co.uk
Mon Aug 20 17:00:41 CDT 2007
> I'm a bit confused by all those QIC designations, since they sometimes s=
> to refer to completely different things...
The vearious QIC standards define certain aspects of QIC (Quarter Inch
Some of them, like QIC11 and QIC24 define the way data is to be recorded
on the tape, the track positions, and so on.
Others, like QIC02 and QIC36 describre the interfaces on the tape drives
themselves.There are basically 2 classes of interface, the 'raw'
interface (for example QIC36), where you essentially have the bitstream
to/from the hard on the interface connector (a bit like a floppy drive
interface in conceopt) and 'formatted' interfaces, like QIC02 where you
send 8-bit bytes to the drive, it buffers them, and writes blocks to the
tape (a bit like SCSI in concept).
> Got one drive here that has a 50-pin connector, and it came along with a=
> 8-bit ISA card -- some sort of a proprietary interface, and I have no id=
I would guess thati's QIC36, but it could be QIC02. If there's a lot of
logic on the ISA card, including RAM, it's likely to be a raw interface.
If the ISA card is little more than an address decoder and
latches/buffers, then it's a foramtteed interface, and there'll be more
logic in the drive iteslf.
There were formatter boards that, for example, connected to a 'raw' drive
on one side (say QIC 36) and provided a fromatted host interface on the
other (like QIC02). The Archive Sidewinder on my PERQ is like that -- the
thing is the size of an 8" floppy drive, the drive itself mounts at the
front of the frame and has a QIC36 interface. It links to a pair of
stached PCBs bolted ot the frame behind the drive, there's a QIC02 host
interface on the back.
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